Extent number / identitifier for a page

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Extent number / identitifier for a page

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ckempste

Posted Wednesday, March 19, 2003 1:57 AM

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Hi all

Does anyone know of (or has info on) how I can retrieve the extent# and/or ID for a specific db file page. The DBCC PAGE command doesnt seem to help.

Cheers

Ck

Chris Kempster
www.chriskempster.com
Author of "SQL Server Backup, Recovery & Troubleshooting"
Author of "SQL Server 2k for the Oracle DBA"

Post #10686

Rodrigo Acosta

Posted Wednesday, March 19, 2003 7:14 AM

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DBCC IND doesn't seems to work either.

Post #56595

ckempste

Posted Wednesday, March 19, 2003 7:28 AM

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DBCC EXTENTINFO

ill see what this can do for me.

Chris Kempster
www.chriskempster.com
Author of "SQL Server Backup, Recovery & Troubleshooting"
Author of "SQL Server 2k for the Oracle DBA"

Post #56596

Rodrigo Acosta

Posted Wednesday, March 19, 2003 7:38 AM

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I didn't know this dbcc command. Can you post the parameters?

Post #56597

ckempste

Posted Wednesday, March 19, 2003 4:51 PM

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From the www.transactsql.com site, great t-sql reference over the books online:

DBCC EXTENTINFO ('@dbname', '@tablename', @indid)
Example
--Display information about the extents in the authors table
--Clean up the display
SET NOCOUNT ON
--List information about the first index in the authors table
DBCC EXTENTINFO ('pubs', 'authors',1)
--List information about all the indexs in the authors table
DBCC EXTENTINFO ('pubs', 'authors')
--List information about all the indexs in the pubs database
DBCC EXTENTINFO ('pubs')
GO

This didnt do it for me, I believe the extent number must be embedded in the header pages that bitmap off the free and used extents, but even so, im still unsure how to extract this info. The command above is close to useless really in terms of extent numbering (logical or physical).

Chris Kempster
www.chriskempster.com
Author of "SQL Server Backup, Recovery & Troubleshooting"
Author of "SQL Server 2k for the Oracle DBA"

Post #56598

ckempste

Posted Wednesday, March 19, 2003 6:17 PM

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Hi all

I believe the key is in dbcc page with the:

Allocation Status
-----------------
GAM (1:2) = ALLOCATED

GAM pages record what extents have been allocated. Each GAM covers 64,000 extents, or nearly 4 GB of data. The GAM has one bit for each extent in the interval it covers. If the bit is 1, the extent is free; if the bit is 0, the extent is allocated.

The key is clearly identifying the GAM page.

Chris Kempster
www.chriskempster.com
Author of "SQL Server Backup, Recovery & Troubleshooting"
Author of "SQL Server 2k for the Oracle DBA"

Post #56599

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